It is recommended to apply perfume just before entering Ihram, and it is recommended to use Musk, and it does not matter if its glistening traces remain
وَحَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، وَابْنُ، بَشَّارٍ قَالاَ حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، حَدَّثَنَا شُعْبَةُ، عَنِ الْحَكَمِ، قَالَ سَمِعْتُ إِبْرَاهِيمَ، يُحَدِّثُ عَنِ الأَسْوَدِ، عَنْ عَائِشَةَ، - رضى الله عنها - أَنَّهَا قَالَتْ كَأَنَّمَا أَنْظُرُ إِلَى وَبِيصِ الطِّيبِ فِي مَفَارِقِ رَسُولِ اللَّهِ صلى الله عليه وسلم وَهُوَ مُحْرِمٌ .
'A'isha (Allah be pleased with her) said: I still seem to see the glistening of the perfume where the hair was parted on Allah's Messeinger's (ﷺ) head while he was in the state of Ihram.